WO2014045028A2 - Matériau et système rétroréfléchissant - Google Patents

Matériau et système rétroréfléchissant Download PDF

Info

Publication number
WO2014045028A2
WO2014045028A2 PCT/GB2013/052437 GB2013052437W WO2014045028A2 WO 2014045028 A2 WO2014045028 A2 WO 2014045028A2 GB 2013052437 W GB2013052437 W GB 2013052437W WO 2014045028 A2 WO2014045028 A2 WO 2014045028A2
Authority
WO
WIPO (PCT)
Prior art keywords
retroreflective
substrate layer
retroreflective material
layer
parabolic
Prior art date
Application number
PCT/GB2013/052437
Other languages
English (en)
Other versions
WO2014045028A3 (fr
Inventor
Michael Ellis
Original Assignee
Retro Reflective Systems Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Retro Reflective Systems Limited filed Critical Retro Reflective Systems Limited
Publication of WO2014045028A2 publication Critical patent/WO2014045028A2/fr
Publication of WO2014045028A3 publication Critical patent/WO2014045028A3/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/12—Reflex reflectors
    • G02B5/126—Reflex reflectors including curved refracting surface
    • G02B5/13—Reflex reflectors including curved refracting surface plural curved refracting elements forming part of a unitary body

Definitions

  • the invention relates to a retroreflective material and to a system comprising the retroreflective material.
  • the system comprises a retroreflective material for use in retroreflective signage and traffic furniture.
  • the invention further relates to a method of manufacture of a retroreflective material.
  • the substrate layer comprises parabolic protruding profiles on the reverse surface of the substrate layer.
  • the substrate layer may further comprise a level or substantially level face surface.
  • one or more of the surfaces of the substrate is coated with a reflecting layer.
  • the reflecting layer may be formed of materials including, but not limited to, aluminium or other metals.
  • the aluminium or other metals may be deposited on the substrate layer by chemical or vapour deposition, vacuum, thermal or pressure transfer, or electro coating.
  • step if) comprises forming a series of adjacent parabolic indentations or projections in one or more surfaces of the substrate layer the parabolic indentations or projections each forming a parabolic retroreflector.
  • a method of manufacturing a retroreflective material comprising a substrate layer and at least one parabolic retroreflector, wherein the method comprises the steps: i) forming a substrate layer with indented adjacent concave parabolic shapes; if) applying a transparent material to one or more surfaces of the substrate layer; iii) allowing the transparent coating to acquire the shape of the individual parabola to create a lens and to further form a levelled layer over the surface of the substrate.
  • retroreflectivity is accomplished by forming a substrate layer with indented adjacent concave parabolic shapes; applying a transparent material to one or more surfaces of the substrate layer in a liquid, powder or solid form, methods include but are not limited to dipping, vapour, spray, spread and/or electrostatic coating, lamination, heat and/or pressure.
  • the transparent coating acquires the shape of the individual parabola to create a lens and further forms a levelled layer over the surface of the substrate.
  • One or more of the sides or edges of the material forming the substrate layer and/or the secondary layer (where present) may be formed or abraded with a roughened surface to diffuse light.
  • a retroreflective system comprising a retroreflective material and a support structure, the support structure being attachable to the retroreflective material.
  • one or more of the support structure and/or the retroreflective system may be illuminated using an internal or an external light source.
  • one or more of the sides or edges of the retroreflective material and/or the support structure may be formed to include retroreflective or reflecting reflectors in similar or differing patterns.
  • the following embodiments describe features of the first, second and/or third aspects of the invention.
  • both the face and reverse surfaces of the substrate layer provide a retroreflective surface comprising at least one parabolic retroreflector.
  • the retroreflective material is a composite with parabolic indentations formed into the rear surface of the substrate layer, and further comprising a secondary transparent liquid layer applied to the face surface of the substrate layer. More specifically, the secondary transparent liquid layer fills the parabolic indentations thereby forming a thin film over the face surface of the substrate layer when cured.
  • the materials of the secondary transparent liquid layer include but are not limited to, combinations of plastics, metals, alloys, resins, fabrics and synthetic materials.
  • the composite material forming the retroreflective material may be rigid or flexible and may be formed as individual sheets or as a continuous reel to reel operation.
  • the layer of material applied to the rear surface of the substrate layer may be formed of a different material to the secondary transparent liquid layer.
  • the different material is a transparent material.
  • the retroreflective material is a composite with parabolic indentations formed into the substrate layer, and further comprising a secondary transparent liquid layer applied to the face surface of the substrate layer. More specifically, the secondary transparent liquid layer fills the parabolic indentations thereby forming a thin film over the face surface of the substrate layer when cured; the retroreflective composite material may then be attached temporarily or permanently to a further backing layer of similar or different material to provide strength and/or rigidity to the resulting structure.
  • Figure 2 shows an alternative retroreflective material according to the invention, comprising a substrate layer having multiple indentions formed in a face surface thereof to provide a plurality of parabolic retroreflectors and a secondary transparent layer applied to the substrate layer;
  • Figure 1 depicts a retroreflective material 10 having a substrate layer 1 and six parabolic retroreflectors 2 in the form of indentations formed in the face surface of the substrate layer 1.
  • a light source directing light onto the parabola in the direction of the arrow "A” will be returned to the light source (not shown) in a direction equal and opposite to the direction "A" and parallel to the axis of symmetry S of each parabolic retroreflector by reflection through the focus "F" of each parabolic retroreflector 2.
  • the boundary layer 7 between the secondary transparent layer 3 and the substrate layer 1 provides enhanced retroreflectivity as compared to the example of the invention depicted in Figure 1.
  • the enhanced retrorflectivity is enhanced further when the refractive index of the substrate layer 1 material and the secondary transparent layer 3 material are different to one another.
  • a retroreflective material comprising a acrylic substrate layer having parabolic retroreflector indentations in a face surface thereof was provided.
  • the retroreflective material further comprises an acrylic transparent secondary layer applied to the face surface of the substrate layer comprising the parabolic indentations in a face surface thereof.
  • a clear acrylic based printing dispersion was prepared.
  • the mixing of printing ink dispersions is well known and need not be described. Three colours were mixed; yellow, red and black, all at 5 phr. pigment concentration.
  • the dispersions were then applied sequentially wet on wet using a manual flat bed screen printer. The design was a circular yellow background with a red border with a black cross located in the centre.
  • the screens were prepared using 43 cm (110/120 in) T polyester mesh, at 40N/cm.
  • the dispersions were printed using polyurethane squeegee blades of 70-75 durometer hardness, with slightly rounded edges, at an angle of approximately 50°. A single pass stroke was used, using medium pressure, with a flood stroke.
  • the dispersions were then applied sequentially wet on wet using a manual flat bed screen printer onto the smooth face surface of the substrate.
  • the design was a circular yellow background with a red border with a black cross located in the centre.
  • the screens were preparing using 40 cm (110/120 in) T polyester mesh, at 40 N/cm.
  • the dispersions were printed using polyurethane squeegee blades of 70-75 durometer hardness, with slightly rounded edges, at an angle of approximately 50°. A single pass stroke was used, using medium pressure, with a flood stroke.
  • the printed composite substrate was then air dried in a warm dry environment to achieve full cure and fusions.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Road Signs Or Road Markings (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne un matériau rétroréfléchissant, comprenant une couche formant substrat présentant au moins un rétroréflecteur parabolique formé dans celle-ci, la fonction mathématique décrivant la parabole étant telle que l'angle d'incidence et l'angle de réflexion de la lumière à partir d'une source lumineuse sont sensiblement égaux sensiblement pour la totalité de la lumière incidente. L'invention concerne en outre un système rétroréfléchissant comprenant ledit matériau rétroréfléchissant, et un procédé de fabrication d'un matériau rétroréfléchissant.
PCT/GB2013/052437 2012-09-18 2013-09-18 Matériau et système rétroréfléchissant WO2014045028A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1216616.1 2012-09-18
GBGB1216616.1A GB201216616D0 (en) 2012-09-18 2012-09-18 Reto reflective material

Publications (2)

Publication Number Publication Date
WO2014045028A2 true WO2014045028A2 (fr) 2014-03-27
WO2014045028A3 WO2014045028A3 (fr) 2014-05-30

Family

ID=47144423

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2013/052437 WO2014045028A2 (fr) 2012-09-18 2013-09-18 Matériau et système rétroréfléchissant

Country Status (2)

Country Link
GB (1) GB201216616D0 (fr)
WO (1) WO2014045028A2 (fr)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR790522A (fr) * 1935-05-24 1935-11-22 Dispositif optique auto-lumineux
US2057395A (en) * 1935-08-01 1936-10-13 Bailey & Sharp Co Inc Reflector
GB468168A (en) * 1936-10-14 1937-06-30 Hubert Henry Burton Improvements in or relating to reflectors or reflecting surfaces, particularly applicable for use as warning devices for the rear of cycles and other road vehicles
US2181725A (en) * 1936-12-28 1939-11-28 Arthur F Eckel Reflector
FR861195A (fr) * 1939-07-21 1941-02-03 Réflecteurs monoconvexe et biconvexe parabolique avec dispositif de chaîne lumineuse
DE837972C (de) * 1950-10-19 1952-05-05 Eugen Schellenbach Rueckstrahler fuer Wegehindernisse, Fahrzeuge od. dgl.
DE3528044A1 (de) * 1985-08-05 1987-02-26 Karin Elke Hildmann Reflektionskoerper
CN1092177A (zh) * 1993-03-10 1994-09-14 陈铭 小曲面反光材料
IL118759A (en) * 1996-06-30 2000-02-29 Itzhak Bar Yona Retroreflective lenticular elements
JP2009053262A (ja) * 2007-08-23 2009-03-12 Tomohiko Fujishima 再帰反射素子及び再帰反射装置並びにそれを用いた再帰反射体
JP5042101B2 (ja) * 2008-03-28 2012-10-03 三菱電機株式会社 太陽電池およびその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Also Published As

Publication number Publication date
GB201216616D0 (en) 2012-10-31
WO2014045028A3 (fr) 2014-05-30

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